We identified flavor ingredients that will give our salad dressing the right flavor balance and also dissolve so there are NO sediments left in the salad dressing. But, we still need to figure out how to create a salad dressing that doesn’t separate!
In order to think more about these questions, we’re going to do a quick demonstration. Watch the videos, hen answer the questions below.
Demonstration #1: Oil and Water
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Question 1
1.
What do you observe about the mixing of these two liquids?
Demonstration #2: Vinegar and Water
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Question 2
2.
What do you observe about the mixing of these two liquids?
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Question 3
3.
If two different substances mix, that means the two different molecules ______________________
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Question 4
4.
If two different substances DO NOT mix, that means the two different molecules ______________________
Testing Attraction
We will be testing how attracted molecules of water are to one another and how attracted molecules of oil are to one another.
To test the attraction between the molecules of a liquid, we’ll put drops of the liquid onto the penny and observe the shape that the drops form and the number of drops that will stay on the penny before the liquid spills over the side.
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Question 5
5.
If a liquid has molecules that are very attracted to one another, would you expect to get more drops or fewer drops to stay on a coin?
Acetone: Watch the video and answer the questions below
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Question 6
6.
Which did acetone look more like after 10 drops, A, B, or C?
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Question 7
7.
How many drops of acetone was added to the coin before it overflows? Type in only the number.
Water: Watch the video and answer the questions below
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Question 8
8.
Which did water look more like after 10 drops, A, B, or C?
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Question 9
9.
How many drops of water was added to the coin before it overflows?
Oil: Watch the video and answer the questions below
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Question 10
10.
Which did oil look more like after 10 drops, A, B, or C?
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Question 11
11.
How many drops of oil was added to the dime before it overflows? Type in only the number.
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Question 12
12.
Which substance had the MOST drops on the coin before spilling?
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Question 13
13.
This means that the molecules of the substance are _____________
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Question 14
14.
Which substance had the LEAST drops on the penny before spilling?
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Question 15
15.
This means that the molecules of the substance are _____________
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Question 16
16.
If a liquid holds together more, which one of these shapes would it be?
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Question 17
17.
Which penny is holding the most liquid?
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Question 18
18.
Are the molecules of the liquid on penny “C” attracted or not attracted to each other?
Rather than just making an inference about whether the substances mix or don’t mix, today we will note how mixed the substances are—on a scale from not mixed to slightly mixed to mostly mixed to completely mixed.
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Question 19
19.
Add Molecule 4 and Molecule 3 into the dish, then mix.
How mixed are these two substances?
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Question 20
20.
Add Molecule 1 and Molecule 6 into the dish, then mix.
How mixed are these two substances?
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Question 21
21.
Add Molecule 2 and Molecule 4 into the dish, then mix.
How mixed are these two substances?
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Question 22
22.
Add Molecule 5 and Molecule 6 into the dish, then mix.
How mixed are these two substances?
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Question 23
23.
What happens when molecules have a high level of attraction to themselves?
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Question 24
24.
When two substances are completely mixed, what level of attraction do their molecules have to one another and to themselves?
